ical.js-one.com/test/parser/utc_offset.json

[](http://travis-ci.org/mozilla-comm/ical.js)

["icalendar",
  ["vcalendar",
    [
      ["x-offset", {}, "utc-offset", "-05:00"],
      ["x-offset-seconds", {}, "utc-offset", "+05:50:01"]
    ],
    []
  ]
]